Electric heating unit.



A. DE KHOTINSKY. ELECTRIC HEATING UNIT. APPUcATloN FILED sEPr. 19. 1914.

Patnted Dec. 19, 1916.

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fcessive heating due/to imperfect, contacts e between' the constituent elementsg'lto vide means of compensating forirregu arities in the' alinement of elements-composing 26'v UNITED STATES ACHILLES nn KHo'rI'NsKY, 'oF CHICAGO, ILLINOIS', sentirmev To CENTRAL SCIENTIFIC ,Courant oF CHICAGO, ILLINOIS, A Conrona'rIoN or ILLINOIS.

ELECTRIC IIEATINQUNI'L To all'whm it may concern minals; to provide a simple and durable,

Be it known thatI, ACHILLES DE KIIoTIN- snnicitizen of' the vUnited States, residing at Chicago, infthe county of .Cook and State of Illinois, have inyented certain new andu useful' Improvements in Electric Heating Units; and I do hereby declare the followmovab1e..portions ofthe heatingunit in.

good. contacting relation to the clrcuit terconstruction of heating units which will "readily withstand the required temperatures following specification and and. in which there will be no losses n'eir-y the said heating unit, thereby reventing an overstraining or t"breaking of t e insulating portions thereof; vand to provide simple means/for cementin conducting and non- 'conductingparts o 'the heating .units to -each' other so as' to prevent a relatlve looseningof such parts.-v

urther objects be aptparent from the rom the aceom-l panying drawing, illustrating the preferred 'embodiment thereof.

In the drawings:

.Figure 1 is Ian elevationof oIle'I-'lof"thevheating;,uni t s. l Fig..2 isa section through f. theh'eating unit and its central terminals. ,4 0-

Fig. 3 is aldetail,4 partially in section, of

one endor` thestructure illustrated in Fig )2,- and 'Figs 4 and5 are enlarged sections rv of portions of one-of theA heating units. y 11 The heating unit isv preferably madeof a tubel-Qofan insulatingmaterial adapted vtot-stand a'high degree ofheat, thesaid tube'. being equipped near each end with atransverse perforation 20. Wound uponthis tube is a high resistance wire 21, one ter.-

minal ofwhich wire lextends through one of the said perforations 20 into the lower end of the tube and presents a free end ,22, Which free end is brought out through a, slot'26/in a "metal capl 23 slippedy over the said lower end @fthe insulating tube. as

Speciuation of Letters Patent. y'

'Pateteanea 19, i916.`

l Application ld September 12,1914. Serial No: 862,511.

sociated with and preferably integral with the saidcap 23 is a threaded shank 25 'ex tendin'gthrough the perforated end of the said cap, the\sai'd shank being provided with a continuation ot the said slot 26 through' which the free end 22 of' the wire is passed.-

to vpermit the end portion thereof to be wrapped around the shank 25 of the bolt.

centrally' perforated' spring vmember 27 v Is" then slipped over the shank of-the vsaid bolt, whereupon the said end portion of the wire 1s clam edbetweenl the contact mem- 'ber 27 and t e adjacent end ofethe cap 23 mit 28- threaded upon the byti hteningvJx said s ank. en in position, the resiliency o f the win s of the contact lmember 2 7 con:

tiniously orcetle same against the walls of the conducting tube 27- surrounding the Mounted upon the other end lof the insulating tube 19 is cap 429 of insulating material corresponding' in outer diameter to the bore of the conducting tube 27 which capcar'ries aboltz28 slotted on one side to permit the .other end of the said wire the cap, the s ank 29 vof said bolt being equipped` with a nut 30 clamping` the adjacent free end of the wire'21.-

'21 to be bron ht' out through the end of i hreadedupon the extreme end ofthe last-named shank 29 is a partially tubular stem 30 carrying at its extreme upper end a plug 31 equipped with a slotted head 32. Extending radially from'the said plug'31v is a pin 3 3 interfitting a Cain slot 34 in a contact cylinder-35 carried by Jan insulating block 36 mounted :upon the tube 27', kthe cylinder 35 beingl 'axially in alinement lwith (but insulated rom the conducting 4tube 27 disposed'belowt e same.

Itwill be evident from Figs. 1' and 2 that the stem 30 together with the hea'd. 32 and the'cylinder 35' afford la holder or carrier by Ineansof which'the tube 19 may' readily be manipulated for inserting or withdra-W- gage the walls of the l"cam :slot 34, so that a partial rotation of .the slotted head 32` by means of a screwdriver will firmly interlock the' membersto prevent an accidental disconnecting thereof, whereupon the wire ving the latter from its normal position' v*within the conducting tubes 27 VllVhen the tube 19 'is thus inserted, the-pin will en- -alinement with the axis ofthe shank 25) so as to coinpensatewfor any suchl i rregu-,.

21 will connected to one terminal of the circuit through the 'wings of the contact member 27' and to1 `the other terminal thereof through a telescopic inter-fitting of the plug 31 with the contact cylinder the upper cap with the insulating tube, and the consequent strain upon `the latter when inserting the lsaine into theconducting tube 27 might tend to kfracture the vfrail 'insu-y lating tube. I therefore preferably provide' the stem 30 with a `number of longitudinal slots 37 affordingaly resiliency which will permit the saidy stem 30 l.to be tilted out of 'larities To fasten the conducting cap 23 andthe insulating cap 29 respectively tothe insiilating tube, I preferablyapply a fusible cement to the interior of each of said caps when asn sembling the parts and thereafter subject each end of the heating element 17 to a sufv ficiently high temperature to melt the said fusible cement, whereupon they same will produce an interlocked bead 38 effectively and permanently uniting the adjacent parts of the heating unit. It will be evident that by making the cam-slot 34 Arelatively steep and by extending-the same only over a fractional part of the circumference of the contact shell- 35it will only be necessary to imparta fractional rotation to `the head' 32 of the heating unit, which fractional rotation will not be sufficient to un'screw the stem 30 from the screw 25 coupled thereto.

However, this fractional rotation, together `with the corresponding longitudinal sliding,

`will cause the contact ,member 27 to rub against the bore of the conducting tube 27 so as to 'insure a clean and firm electrical connection.

It will be evident from'Figs. 4 and 5 that ,f

the transverse perforations 2O near the` re, spective ends of the insulating tube 19 will permit the ends ofthe high resistance wire 21 to be brought out through the slotted sha-iiks 25 and 29 of the screw terminals associated with the ends of the said tube.

It Will be apparent thatyarious` changes Vmay be made in the form, construction vand arrangement of the parts Without departing from the Spirit and scope of the invention, or sacrificing any of its material advantages, the form hereinloefore described being merely a preferred embodiment thereof.

claim as my invention z- 1. 'A mounting for'an electric heating unit, having exposed terminals, comprising a pair of alined sockets forming 'circuit connections, and an auxiliary element threaded upon one terminal of the unit and presentino an exposed contact, saidcontact and the other of said terminals contacting respec- In prac-4 tice, it is usually ditlicult to insure an axialA alinement-of the shank 2Q associated with tivelywith the said sockets,tlie `said contact and the socket contacting therewith being operatively connected by a screw' formation reverse to and of considerably greater pitch than the said threaded connection between y the auxiliary element and the unit.

2. An electric heating element including a tube of insulating material, a resistance wire disposed uponthe surface thereof, a flexible contact mounted at one end of said tube and connected to one end of said resistance wire, a metal element carried vby the other end of said tube and connected-.to the other end of said u'ire, a conducting member coupled to said element and ronnectiiig'the latter tofone terminal of the circuit, and fj means associated with said coupling for permitting a tilting ofthe saidv coupling .element with' respect to the said conducting member.

A11 electric heating'iinit including in combination with a cylindrical member of insulating` material and a resistance wire disposed thereon, a pair of caps mounted on the respective ends of the said insulating element, contact members carried by the respective caps and carried respectively by the ends of the resistance wire, and a set fusible material simultaneously securing each of said caps and the contact member adjacent thereto to said tube.

4. In aheating unit, in combination with a stem of insulating material and a high resistance wire wound thereon, a cap of insulating material slipped over one end of said stemand equipped with a perforation substantially axial of said stem, and a screw' ioo of conducting material extendingr through said perforation and having its head disposed within said cap, the said screw equipped with a slot permitting the adjacent end of the high resistance wire to ybe Vbrought through "the said perforation.

5. The combination with a pair of sub- I stantially alined circuit terminals of a heating unit including an insulating cylinder, a resistance wire Wound thereon,` a pair of contact elements mounted on the respective ends of the cylinder and respectively connected to the endsof said wire, said con-l` tact elements normally entering., the respective terminals, there being yielding means associated with one of said terminals and the contact entered thereby for compensate `ing a lack ofalincineiit of said contacts and terminals, `and means' for interlocking the other of said terminals with the contact entered thereby.

6. The combination Withla tube and a cir` cuit terminaliy associated'witli one end thereof, o f a heating unit disposedin said tube and including an insulating cylinder, a re-y sistance `Wire Wound thereon, contact elements mounted on the respective ends of the cylinder and connected to the respective ends 0f the Wlre, arid. an insulating bushing carried by one end of the cylinder and spacing vthe adjacent contact from the tube, and a second circuit terminal insulated from said tube and normally contactingwith the last named Contact, the other of said' con-v tacts normally contacting with the first named circuit terminal.

senting contact portions within said tube, of

a heating unit including a resistance element shorter than the distance between said Contact portions, and a locking element yieldinglyconnected to one end of the resistance element and detachably interlocked,

with one of said contact portions.

8. The combination with a tube and a pair of relatively insulated circuit terminals pre `shorter than the distance between said contact'portions, and a locking element yieldingly connected to one end of the resistance element and detachably 'interlocked with one of said contact portions, andA an insulating bushing carried by the said element and spacing the said end thereof' from the tube.

In testimony whereof I have signed my name in presence of two subscribing witnesses.

ACHILLES DE KHOTINSKY. Witnesses:

" G. M. NEYILLE,

M. M. Bonn. 

